Magnetic Excitations in the Spin Gap System TlCuCl$_3$

Details Magnetic Excitations in the Spin Gap System TlCuCl$_3$ Magnetic Excitations in the Spin Gap System TlCuCl$_3$

2000-04-07

arxiv.org/abs/cond-mat/0004108v1

Physics

Condensed Matter

8 pages, revtex, 10 eps figures

Scientific paper

Single-crystal neutron inelastic scattering was performed in order to investigate the magnetic excitations in the spin gap system TlCuCl$_3$. The constant-${\bf Q}$ energy scan profiles were collected in the $a^*-c^*$ plane. Three excitations are observed for $E{\leq}15$ meV. One of the excitations is identified to be magnetic excitation. The lowest magnetic excitation with $E\sim 0.5$ meV occurs at ${\bf Q}=(1, 0, 1)$, as observed in KCuCl$_3$. The dispersion relation of the magnetic excitation can be fitted to the dispersion formula derived from the weakly coupled dimer model. The intradimer interaction is evaluated as $J=5.23$ meV, which coincides with the value estimated from the susceptibility data. However, one of the interdimer interactions obtained is so large that the weakly coupled dimer model is broken down.

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